在弹出窗口中使用 TextBubbleBorder

Question

首先非常感谢 Andrew Thompson 对圆角边框的解决方案。现在我的问题。我尝试在我们的应用程序中添加“新功能”功能（指向新组件的小气泡）。除了边框的透明度功能外，一切正常。这是我的 MCVE（抱歉有点长，因为它包含 Andrew 编写的代码）。import java.awt.BasicStroke;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Component;import java.awt.Cursor;import java.awt.Dimension;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Insets;import java.awt.Point;import java.awt.Polygon;import java.awt.Rectangle;import java.awt.RenderingHints;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.font.TextAttribute;import java.awt.geom.Area;import java.awt.geom.RoundRectangle2D;import java.util.Collections;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.Popup;import javax.swing.PopupFactory;import javax.swing.UIManager;import javax.swing.WindowConstants;import javax.swing.border.AbstractBorder;这是我得到的结果 如您所见，弹出窗口的底部不是透明的。我明白为什么会这样（最初的解决方案不适合这种情况），但找不到解决方案。有任何想法吗？

Answer 1

看看半透明和异形摆动窗| 爪哇网。可能会有所帮助。

// Add Popup to a transparent JWindow to create and display.

PopupFactory.setSharedInstance(new TranslucentPopupFactory());

// popup should only be closed when user clicks the "Close" button.

Popup popup = PopupFactory.getSharedInstance().getPopup(button, hintPanel, x, y);

PopupTryout2.java

import java.awt.*;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.font.TextAttribute;

import java.awt.geom.Area;

import java.awt.geom.RoundRectangle2D;

import java.util.Collections;

import javax.swing.*;

import javax.swing.border.AbstractBorder;

public class PopupTryout2 {

  public static void main(String[] args) {

    JFrame frm = new JFrame("Popup test");

    JButton button = new JButton("Test");

    JPanel p = new JPanel();

    p.add(button);

    frm.add(p, BorderLayout.SOUTH);

    frm.add(new JScrollPane(new JTextArea()));

    JPanel hintPanel = new JPanel();

    hintPanel.add(new JLabel("This button has no function ;)"));

    hintPanel.setOpaque(false);

    JLabel closeBtn = new JLabel("Close");

    closeBtn.setForeground(Color.BLUE);

    closeBtn.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

    hintPanel.add(closeBtn);

    hintPanel.setBorder(new TextBubbleBorder(Color.BLACK, 1, 6, 8, false));

    hintPanel.setOpaque(false);

    frm.setSize(600, 500);

    frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    frm.setLocationRelativeTo(null);

    frm.setVisible(true);

    Point pt = button.getLocationOnScreen();

    Dimension panelSize = hintPanel.getPreferredSize();

    Dimension buttonSize = button.getSize();

    int x = pt.x + buttonSize.width - panelSize.width;

    int y = pt.y - panelSize.height - 10;

    PopupFactory.setSharedInstance(new TranslucentPopupFactory());

    // popup should only be closed when user clicks the "Close" button.

    Popup popup = PopupFactory.getSharedInstance().getPopup(button, hintPanel, x, y);

    popup.show();

    // "link style" button

    closeBtn.addMouseListener(new MouseAdapter() {

      @Override public void mouseEntered(MouseEvent e) {

        Font f = e.getComponent().getFont();

        e.getComponent().setFont(underlineOn(f));

      }

      @Override public void mouseExited(MouseEvent e) {

        e.getComponent().setFont(UIManager.getFont("Label.font"));

      }

      @Override public void mousePressed(MouseEvent e) {

        popup.hide();

      }

    });

  }

  public static Font underlineOn(Font aBaseFont) {

    return aBaseFont.deriveFont(Collections.singletonMap(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON));

  }

  static class TextBubbleBorder extends AbstractBorder {

    private Color color;

    private int thickness = 4;

    private int radii = 8;

    private int pointerSize = 7;

    private Insets insets = null;

    private BasicStroke stroke = null;

    private int strokePad;

    private int pointerPad = 4;

    private boolean left = true;

    RenderingHints hints;

    TextBubbleBorder(Color color) {

      this(color, 4, 8, 7);

    }

    TextBubbleBorder(Color color, int thickness, int radii, int pointerSize) {

      this.thickness = thickness;

      this.radii = radii;

      this.pointerSize = pointerSize;

      this.color = color;

      stroke = new BasicStroke(thickness);

      strokePad = thickness / 2;

      hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

      int pad = radii + strokePad;

      int bottomPad = pad + pointerSize + strokePad;

      insets = new Insets(pad, pad, bottomPad, pad);

    }

    TextBubbleBorder(Color color, int thickness, int radii, int pointerSize, boolean left) {

      this(color, thickness, radii, pointerSize);

      this.left = left;

    }

    @Override public Insets getBorderInsets(Component c) {

      return insets;

    }

    @Override public Insets getBorderInsets(Component c, Insets insets) {

      return getBorderInsets(c);

    }

    @Override public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {

      Graphics2D g2 = (Graphics2D) g;

      int bottomLineY = height - thickness - pointerSize;

      RoundRectangle2D.Double bubble =

        new RoundRectangle2D.Double(0 + strokePad, 0 + strokePad, width - thickness, bottomLineY, radii, radii);

      Polygon pointer = new Polygon();

      if (left) {

        pointer.addPoint(strokePad + radii + pointerPad, bottomLineY);

        pointer.addPoint(strokePad + radii + pointerPad + pointerSize, bottomLineY);

        pointer.addPoint(strokePad + radii + pointerPad + (pointerSize / 2), height - strokePad);

      } else {

        pointer.addPoint(width - (strokePad + radii + pointerPad), bottomLineY);

        pointer.addPoint(width - (strokePad + radii + pointerPad + pointerSize), bottomLineY);

        pointer.addPoint(width - (strokePad + radii + pointerPad + (pointerSize / 2)), height - strokePad);

      }

      Area area = new Area(bubble);

      area.add(new Area(pointer));

      g2.setRenderingHints(hints);

      // Paint the BG color of the parent, everywhere outside the clip

      // of the text bubble.

      Component parent = c.getParent();

      if (parent != null) {

        Color bg = parent.getBackground();

        // Rectangle rect = new Rectangle(0, 0, width, height);

        // Area borderRegion = new Area(rect);

        // borderRegion.subtract(area);

        // g2.setClip(borderRegion);

        // g2.setColor(bg);

        // g2.fillRect(0, 0, width, height);

        // g2.setClip(null);

        g2.setPaint(bg);

        g2.fill(area);

      }

      g2.setColor(color);

      g2.setStroke(stroke);

      g2.draw(area);

    }

  }

}

/*

@see http://today.java.net/pub/a/today/2008/03/18/translucent-and-shaped-swing-windows.html

https://web.archive.org/web/20150515015137/http://today.java.net/pub/a/today/2008/03/18/translucent-and-shaped-swing-windows.html

Translucent and Shaped Swing Windows | Java.net

*/

class TranslucentPopupFactory extends PopupFactory {

  @Override public Popup getPopup(Component owner, Component contents, int x, int y) {

    return new TranslucentPopup(owner, contents, x, y);

  }

}

class TranslucentPopup extends Popup {

  private final JWindow popupWindow;

  protected TranslucentPopup(Component owner, Component contents, int ownerX, int ownerY) {

    super(owner, contents, ownerX, ownerY);

    // create a new heavyweight window

    this.popupWindow = new JWindow();

    // mark the popup with partial opacity

    // AWTUtilities.setWindowOpacity(popupWindow, (contents instanceof JToolTip) ? .8f : .95f);

    // popupWindow.setOpacity(.5f);

    // AWTUtilities.setWindowOpaque(popupWindow, false); // Java 1.6.0_10

    popupWindow.setBackground(new Color(0x0, true)); // Java 1.7.0

    // determine the popup location

    popupWindow.setLocation(ownerX, ownerY);

    // add the contents to the popup

    popupWindow.getContentPane().add(contents);

    contents.invalidate();

    // JComponent parent = (JComponent) contents.getParent();

    // set the shadow border

    // parent.setBorder(new ShadowPopupBorder());

  }

  @Override public void show() {

    System.out.println("Always Heavy weight!");

    this.popupWindow.setVisible(true);

    this.popupWindow.pack();

    // mark the window as non-opaque, so that the

    // shadow border pixels take on the per-pixel

    // translucency

    // AWTUtilities.setWindowOpaque(this.popupWindow, false);

  }

  @Override public void hide() {

    this.popupWindow.setVisible(false);

    this.popupWindow.removeAll();

    this.popupWindow.dispose();

  }

}